James Hahn's rookie season on the PGA Tour is off to a promising start. Hahn made the cut in each of his first four starts, including a tie for fourth in the tournament near Palm Springs and a tie for 16th on Sunday in Scottsdale, Ariz.

And all anyone wants to talk about is his Gangnam-style dance.

Hahn - who grew up in Alameda, attended Cal and now lives in San Bruno - set aside his mild-mannered persona in Sunday's final round in Scottsdale. He rolled home a 20-foot birdie putt on No. 16, the famous party hole where more than 15,000 rowdy, well-oiled spectators congregate, and then he let loose.

Hahn animatedly and gracefully danced his way off the green, to the crowd's loud approval. Video of his moves quickly became a YouTube hit, with more than 180,000 views as of Tuesday afternoon.

"I knew I wanted it to be something special, something fun, but it would only happen if I made birdie," Hahn said. "I lifted my putter, walked off the green and was possessed. The crowd was going crazy. ... I can't believe I did that."

The throng at No. 16 at TPC Scottsdale also can be ruthless, as Hahn learned when the fans booed him after his third-round double bogey. But he won them back Sunday - his birdie was part of a final-round 62, the second time this year he shot 62.

Hahn has earned $352,796 on the PGA Tour in 2013, more than he made all of last season on the Nationwide-turned-Web.com Tour. Hahn stands No. 25 on the money list entering this week's AT&T Pro-Am.

Harbaugh returns: 49ers head coach Jim Harbaughis in the amateur field this week, as he was last year. Just a guess here, but Alex Smithprobably will not moonlight as Harbaugh's caddie this time.

Briefly: Vijay Singhwas spotted playing a practice round at Pebble. Singh withdrew from last week's tour event, after revelations he used a banned substance. ... Johnny Miller, Roger Maltbie and Kay Cockerill were inducted into the Northern California Golf Association Hall of Fame.